<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">

	<head>
		<title>jQuery实现购物车多物品数量的加减+总价计算</title>
		<script type="text/javascript" src="http://code.jquery.com/jquery-1.6.1.min.js"></script>
		<script>
			$(function() {
				$(".add").click(function() {
					var t = $(this).parent().find('input[class*=text_box]');
					t.val(parseInt(t.val()) + 1)
					setTotal();
				})
				$(".min").click(function() {
					var t = $(this).parent().find('input[class*=text_box]');
					t.val(parseInt(t.val()) - 1)
					if(parseInt(t.val()) < 0) {
						t.val(0);
					}
					setTotal();
				})

				function setTotal() {
					var s = 0;
					$("#tab td").each(function() {
						s += parseInt($(this).find('input[class*=text_box]').val()) * parseFloat($(this).find('span[class*=price]').text());
					});
					$("#total").html(s.toFixed(2));
				}
				setTotal();

			})
		</script>
	</head>

	<body>
		<table id="tab">
			<tr>
				<td>
					<span>单价:</span><span class="price">1.50</span>
					<input class="min" name="" type="button" value="-" />
					<input class="text_box" name="" type="text" value="1" />
					<input class="add" name="" type="button" value="+" />
				</td>
			</tr>
			<tr>
				<td>
					<span>单价:</span><span class="price">3.95</span>
					<input class="min" name="" type="button" value="-" />
					<input class="text_box" name="" type="text" value="1" />
					<input class="add" name="" type="button" value="+" />
				</td>
			</tr>
		</table>

		<p>总价：<label id="total"></label></p>
	</body>

</html>